Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 3,5-Dimethyl-4-nitropyridine 1-oxide, is researched, Molecular C7H8N2O3, CAS is 14248-66-9, about Potentiometric studies of acid-base interactions in substituted 4-nitropyridine N-oxide systems.Application of 14248-66-9.
(Acid + base) equilibrium constants, involving the acidity (pKACa) and cationic homoconjugation constants (in the form of lg KANBHB+), have been determined by the potentiometric method in 13 systems formed by substituted 4-nitropyridine N-oxides in the polar aprotic solvent, acetone (AC). The derivatives covered a wide range of proton-acceptor properties and inherent diversified tendencies towards formation of hydrogen-bonded cations. In addition, the constant values (expressed as pKANa and lg KANBHB+) for two of the systems studied, N-oxides of 2-methylamino- and 2-ethylamino-4-nitropyridine, were determined in acetonitrile (AN). The acidity constants in the non-aqueous media studied have been found to change in line with their substituent effects and the sequence of acidity changes in water. The values of the cationic homoconjugation constants increased with increasing basicity of the N-oxides and decreased with increasing solvent basicity.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem